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Cash and cash equivalents and Investments and Additional information on the consolidated statements of cash flows - Breakdown of dividends paid by company (Details) $ / shares in Units, ₲ in Millions, $ in Millions |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 29, 2017 ARS ($) | Dec. 18, 2017 ARS ($) | Mar. 28, 2017 PYG (₲) | Aug. 26, 2016 ARS ($) | May 13, 2016 ARS ($) | Apr. 29, 2016 ARS ($) installment | Dec. 17, 2015 PYG (₲) | May 11, 2015 ARS ($) | Apr. 29, 2015 $ / shares | Mar. 26, 2015 PYG (₲) | Oct. 31, 2017 ARS ($) | May 31, 2017 ARS ($) | Dec. 31, 2015 ARS ($) | May 31, 2015 ARS ($) | Dec. 31, 2017 ARS ($) $ / shares | Dec. 31, 2016 ARS ($) $ / shares | Dec. 31, 2015 ARS ($) $ / shares | Mar. 28, 2017 ARS ($) | Dec. 17, 2015 ARS ($) | Mar. 26, 2015 ARS ($)
Dividends paid by company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nucleo to ABC Telecomunicaciones |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (38.0) |  |  |  | $ (45.0) |  |  |  |
Nortel and Telecom Argentina non-controlling interest |  |  |  | $ (1,300.0) | $ (700.0) |  |  |  |  |  |  |  |  |  | (4,151.0) |  | $ (2,000.0) |  | (804.0) |  |  |  |
Dividends advance declared by Sofora and paid by Telecom in December 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3.0) |  |  |  |  |  |  |  |
Payment of cash dividend |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (4,192.0) |  | $ (2,000.0) |  | $ (849.0) |  |  |  |
Reserve for future cash dividends payments |  | $ 4,150.3 |  |  |  | $ 2,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend per outstanding share | $ / shares |  |  |  |  |  |  |  |  | $ 0.83 |  |  |  |  |  | $ 4.28 |  | $ 2.06 |  | $ 0.83 |  |  |  |
Number of Cash Dividend Distribution installments | installment |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared |  |  |  |  |  |  |  | $ 804.0 |  |  |  |  |  |  | $ 4,151.0 | [1] | $ 2,000.0 | [2] | $ 804.0 | [3] |  |  |
Nucleo |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid by company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid |  |  | ₲ 40,000 |  |  |  | ₲ 35,000 |  |  | ₲ 35,000 | $ 55.0 | $ 54.0 | $ 80.0 | $ 63.0 | 109.0 |  |  |  | 143.0 |  |  |  |
Dividends approved |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 109.0 | $ 80.0 | $ 63.0
Nucleo | Personal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid by company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of cash dividend |  |  |  |  |  |  |  |  |  |  | (41.0) | (39.0) | (52.0) | (41.0) |  |  |  |  |  |  |  |  |
Dividends paid |  |  |  |  |  |  |  |  |  |  | 37.0 | 37.0 | 54.0 | 42.0 | 74.0 |  |  |  | 96.0 |  |  |  |
Nucleo | ABC Telecomunicaciones |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid by company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of cash dividend |  |  |  |  |  |  |  |  |  |  | (20.0) | (18.0) | (26.0) | (19.0) |  |  |  |  |  |  |  |  |
Dividends paid |  |  |  |  |  |  |  |  |  |  | $ 18.0 | $ 17.0 | $ 26.0 | $ 21.0 | $ 35.0 |  |  |  | $ 47.0 |  |  |  |
Sofora |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid by company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid | $ 2.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | As approved by the Company’s Board of Directors’ Meeting held on December 18, 2017. The amount in pesos is $ 4,150,312,272, which was rounded in this Consolidated Statement of changes in equity to be presented in millions of pesos to 4,151.
[2] | As approved by the Company's Board of Directors' Meeting held on April 29, 2016.
[3] | As approved by the Company’s Ordinary Shareholders’ Meeting held on April 29, 2015.

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